Question 1

The opacity of the atmosphere is partially corrected via adaptive optics.

Accepted Answer

A) True 
 B)False

Question 2

A mirror must be in shape to reflect the light back to a focus.

Accepted Answer

curved, co...

Question 3

optics deform the shape of the mirror to compensate for the turbulence in the atmosphere and yield a close to diffraction- limited image.

Accepted Answer

A)   CCD
B)   Parabolic
C)   Coherent
D)   Collimating
E)   Adaptive

Question 4

Radio telescopes have poorer angular resolution than optical telescopes because radio waves have a much longer wavelength than optical waves.

Accepted Answer

A) True 
 B)False

Question 5

Why is the angular resolution of radio telescopes much worse than that of smaller optical telescopes?

Accepted Answer

Radio waves are much longer in...

Question 6

What problem does adaptive optics correct?

Accepted Answer

A)   the opacity of the Earth's atmosphere to some wavelengths of light
B)   turbulence in the Earth's atmosphere that creates twinkling
C)   defects in the optics of the telescope, such as the original Hubble mirror
D)   the light pollution of urban areas
E)   chromatic aberration due to use of only a single lens objective

Question 7

The mirrors for X- ray telescopes are the same shape as those of optical reflectors.

Accepted Answer

A) True 
 B)False

Question 8

With a prime focus reflector, why is digital imaging much easier than using an eyepiece for visual work?

Accepted Answer

A CCD is tiny, and blocks litt...

Question 9

The ability of a telescope to separate two closely spaced stars is called _.

Accepted Answer

The answer of The ability of a telescope to separate...

Question 10

Explain why the image seen in astronomical telescopes is inverted.

Accepted Answer

In both reflectors and refract...

Question 11

Why doesn't the Hubble Space Telescope need adaptive optics?

Accepted Answer

Adaptive optics correct poor s...

Question 12

The light- gathering power of a telescope varies with the of the diameter of the lens or mirror.

Accepted Answer

The answer of The light- gathering power of a telescope...

Question 13

What problem do refractor telescopes have that reflectors don't?

Accepted Answer

A)   light loss from secondary elements
B)   bad seeing
C)   diffraction limited resolution
D)   atmospheric blurring
E)   chromatic aberration

Question 14

Galaxies look the same whether viewed in visible or X- ray wavelengths.

Accepted Answer

A) True 
 B)False

Question 15

A lens must be _ in shape to focus the transmitted light.

Accepted Answer

The answer of A lens must be _ in shape...

Question 16

optics greatly reduces the effect of atmospheric turbulence by deforming the shape of the mirror by computer control.

Accepted Answer

The answer of optics greatly reduces the effect of atmospheric...

Question 17

What is the light- gathering power of an 8- inch telescope compared to a 4- inch telescope?

Accepted Answer

A)   32 times better
B)   2 times better
C)   16 times better
D)   8 times better
E)   4 times better

Question 18

If the _ is good, the atmosphere is stable, and image quality is sharp.

Accepted Answer

The answer of If the _ is good, the atmosphere...

Question 19

The amount of diffraction and thus the resolution of the telescope depends upon

Accepted Answer

A)   the design of the telescope.
B)   the wavelength used and the size of the main telescope objective lens or mirror.
C)   the size and sensitivity of the CCD chip used for imaging.
D)   the brightness of the object.
E)   whether the telescope is a reflector or refractor.

Question 20

Green light has a shorter wavelength than orange light. In a 5- inch telescope, green light will

Accepted Answer

A)   provide better angular resolution than orange light.
B)   come to the same exact focus as orange light.
C)   reduce the effects of atmospheric turbulence.
D)   provide worse angular resolution than orange light.
E)   allow dimmer stars to be observed.

Exam 4: Telescopes: the Tools of Astronomy

The light- gathering power of a telescope varies with the of the diameter of the lens or mirror.

Correct AnswerverifiedShow Answer

With a prime focus reflector, why is digital imaging much easier than using an eyepiece for visual work?

Correct AnswerverifiedA CCD is tiny, and blocks litt...View AnswerShow Answer

The amount of diffraction and thus the resolution of the telescope depends upon

Correct AnswerverifiedShow Answer

A mirror must be in shape to reflect the light back to a focus.

Correct Answerverifiedcurved, co...View AnswerShow Answer

Green light has a shorter wavelength than orange light. In a 5- inch telescope, green light will

Correct AnswerverifiedShow Answer

What problem does adaptive optics correct?

Correct AnswerverifiedShow Answer

The mirrors for X- ray telescopes are the same shape as those of optical reflectors.

Correct AnswerverifiedShow Answer

The ability of a telescope to separate two closely spaced stars is called _.

Correct AnswerverifiedShow Answer

What is the light- gathering power of an 8- inch telescope compared to a 4- inch telescope?

Correct AnswerverifiedShow Answer

Why doesn't the Hubble Space Telescope need adaptive optics?

Correct AnswerverifiedAdaptive optics correct poor s...View AnswerShow Answer

The opacity of the atmosphere is partially corrected via adaptive optics.

Correct AnswerverifiedShow Answer

Explain why the image seen in astronomical telescopes is inverted.

Correct AnswerverifiedIn both reflectors and refract...View AnswerShow Answer

Galaxies look the same whether viewed in visible or X- ray wavelengths.

Correct AnswerverifiedShow Answer

A lens must be _ in shape to focus the transmitted light.

Correct AnswerverifiedShow Answer

optics deform the shape of the mirror to compensate for the turbulence in the atmosphere and yield a close to diffraction- limited image.

Correct AnswerverifiedShow Answer

If the _ is good, the atmosphere is stable, and image quality is sharp.

Correct AnswerverifiedShow Answer

optics greatly reduces the effect of atmospheric turbulence by deforming the shape of the mirror by computer control.

Correct AnswerverifiedShow Answer

Radio telescopes have poorer angular resolution than optical telescopes because radio waves have a much longer wavelength than optical waves.

Correct AnswerverifiedShow Answer

Why is the angular resolution of radio telescopes much worse than that of smaller optical telescopes?

Correct AnswerverifiedRadio waves are much longer in...View AnswerShow Answer

What problem do refractor telescopes have that reflectors don't?

Correct AnswerverifiedShow Answer

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A CCD is tiny, and blocks litt...
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curved, co...
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Correct Answer
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Adaptive optics correct poor s...
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In both reflectors and refract...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Radio waves are much longer in...
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